Device And Method For Manufacturing Wrapped Tubes

Abstract

In a device and a method for manufacturing wrapped tubes by helically winding up a thermoplastic, preferably strip-shaped plastic profile ( 2 ) onto a winding core ( 1 ) in an overlapping manner, where a plasticizing aggregate supplies the plastic profile ( 2 ) via a profile nozzle ( 4 ), it is provided that the plasticizing aggregate is a kneading means ( 3 ) supplying a thermoplastic plastic mixed with reinforcing fibers to the winding core ( 1 ) via the profile nozzle ( 4 ).

1 . A device for manufacturing wrapped tubes by helically winding up a thermoplastic, preferably strip-shaped plastic profile ( 2 ) onto a winding core ( 1 ), a plasticizing aggregate supplying the plastic profile ( 2 ) to the winding core ( 1 ) via a profile nozzle ( 4 ),
 characterized in   that the plasticizing aggregate is a kneading means ( 3 ) supplying a thermoplastic plastic mixed with reinforcing fibers via the profile nozzle ( 4 ).   
   
   
       2 . The device according to  claim 1 , characterized in that the kneading means is a screw kneading aggregate. 
   
   
       3 . The device according to  claim 1 , characterized in that the thermoplastic plastic consists of polyethylene or polypropylene. 
   
   
       4 . The device according to  claim 1  characterized in that the reinforcing fibers consist of plastic, glass and/or metal. 
   
   
       5 . The device according to  claim 3 , characterized in that the reinforcing fibers consist of glass fibers, aramide fibers and/or carbon fibers. 
   
   
       6 . The device according to  claim 4 , characterized in that the fiber length of the reinforcing fibers amounts to at least 2 mm, preferably to more than 4 mm up to endless. 
   
   
       7 . The device according to  claim 1 , characterized in that the wrapped tube consists of several superposed winding layers ( 9   a,    9   b ) formed of the plastic profile ( 2 ) and extending under an oblique angle relative to each other. 
   
   
       8 . The device according to  claim 1 , characterized in that the fiber-reinforced mixture homogenized in the kneading means ( 3 ) consists of
 60 to  94  percent by weight of polyethylene or polypropylene   1 to 10 percent by weight of bonding agent as well as   5 to 40 percent by weight of reinforcing fibers.   
   
   
       9 . A method for manufacturing wrapped tubes by winding up a thermoplastic, preferably strip-shaped plastic profile ( 2 ) onto a winding core ( 1 ) in an overlapping manner, the plastic profile ( 2 ) being supplied to the winding core ( 1 ) from a plasticizing aggregate and a profile nozzle ( 4 ),
 characterized in   that a kneading means ( 3 ) is employed as a plasticizing aggregate for manufacturing wrapped tubes with an increased internal pressure resistance,   and that a thermoplastic plastic is brought to a predetermined melting temperature and homogeneously mixed with reinforcing fibers in the screw kneader ( 3 ),   the fiber-reinforced homogenized thermoplastic plastic mixture being subsequently supplied to the winding core ( 1 ) via the profile nozzle ( 4 ).   
   
   
       10 . The method according to  claim 9 , characterized in that polyethylene or polypropylene is used as thermoplastic plastic. 
   
   
       11 . The method according to  claim 7 , characterized in that reinforcing fibers of plastic, glass and/or metal are used. 
   
   
       12 . The method according to  claim 9 , characterized in that the wrapped tube is formed of several winding layers ( 9   a,    9   b ) wrapped on top of each other. 
   
   
       13 . The method according to  claim 12 , characterized in that the plastic profile ( 2 ) is supplied to the winding core ( 1 ) under a predetermined oblique angle. 
   
   
       14 . The method according to  claim 12 , characterized in that the several winding layers ( 9   a,    9   b ) are wound up continuously and that at the reversal positions at the ends of the winding core ( 1 ), the oblique angle changes to a different oblique angle with opposite direction due to the reversal of the winding direction in such a manner that succeeding winding layers ( 9   a,    9   b ) cross each other. 
   
   
       15 . The method according to  claim 12 , characterized in that the innermost and/or the outermost winding layer is wound of polyethylene without any fiber reinforcement. 
   
   
       16 . A wrapped tube manufactured according to the method according to  claim 9 , characterized in that it consists of a fiber-reinforced homogeneous mixture of
 60 to 94 percent by weight of polyethylene or polypropylene   1 to 10 percent by weight of bonding agent as well as   5 to 40 percent by weight of reinforcing fibers arranged in random orientation.   
   
   
       17 . The device according to  claim 2 , characterized in that the thermoplastic plastic consists of polyethylene or polypropylene. 
   
   
       18 . The device according to  claim 5 , characterized in that the fiber length of the reinforcing fibers amounts to at least 2 mm, preferably to more than 4 mm up to endless. 
   
   
       19 . The method according to  claim 8 , characterized in that reinforcing fibers of plastic, glass and/or metal are used. 
   
   
       20 . The method according to  claim 13 , characterized in that the several winding layers ( 9   a,    9   b ) are wound up continuously and that at the reversal positions at the ends of the winding core ( 1 ), the oblique angle changes to a different oblique angle with opposite direction due to the reversal of the winding direction in such a manner that succeeding winding layers ( 9   a,    9   b ) cross each other.